Method of treating water containing chromate

Details Method of treating water containing chromate Method of treating water containing chromate

1976-04-30

1977-07-19

Wyse, Thomas G.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 37B, B01D 1506, B01J 109, C02B 156, C02B 176

Patent

active

040367517

ABSTRACT:
A method of treating water containing chromate by bringing the water-to-be-treated into contact with ion-exchange resins, which comprises: passing the water-to-be-treated through a bed of weakly acidic cation exchange resin in H-form at first; subsequently passing the same water through a bed of weakly basic anion exchange resin in salt form thereby to remove said chromate from the water; introducing an alkali metal hydroxide solution into said weakly basic anion exchange resin bed in the reverse direction relative to the direction of passing of the water thereby to elute chromate; and further introducing an acid solution therein thereby to convert the weakly basic anion exchange resin into salt form.

REFERENCES:
patent: 3386914 (1968-06-01), Hunter
patent: 3632506 (1972-01-01), Adams
patent: 3639231 (1972-02-01), Bresler
patent: 3664950 (1972-05-01), Saraceno
patent: 3679580 (1972-07-01), Boari
patent: 3788983 (1974-01-01), Fries
patent: 3928192 (1975-12-01), Katzakian
patent: 3933631 (1976-01-01), Adams
patent: 3961029 (1976-06-01), Senoo
patent: 3972810 (1976-08-01), Chopra
patent: 3982956 (1976-09-01), Schoenrock
patent: 3985648 (1976-10-01), Casolo

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